μPD75P308
MAIN SYSTEM CLOCK OSCILLATOR CIRCUIT CHARACTERISTICS
(Ta = -10 to +70°C, VDD = 5 to ±5 V)
Recommended | |
Oscillator |
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Constants | |
Ceramic*3 |
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X1 | X2 |
C1 | C2 |
| VDD |
Crystal |
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X1 | X2 |
C1 | C2 |
| VDD |
External Clock |
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X1 | X2 |
| μPD74HCU04 |
Item | Conditions | MIN. | TYP. | MAX. | Unit |
Oscillation |
| 1.0 |
| 5.0*4 | MHz |
frequency (fXX)*1 |
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Oscillation stabilization | After VDD came to MIN. |
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| 4 | ms |
time*2 | of oscillation voltage range |
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Oscilaltion |
| 1.0 | 4.19 | 5.0*4 | MHz |
frequency (fXX)*1 |
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Oscillation stabilization |
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| 10 | ms |
time*2 |
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X1 input frequency |
| 1.0 |
| 5.0*4 | MHz |
(fX)*1 |
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X1 input |
| 100 |
| 500 | ns |
widths (tXH, tXL) |
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*1: The oscillation frequency and X1 input frequency are indicated only to express the characteristics of the oscillator circuit.
For instruction execution time, refer to AC Characteristics.
2:Time required for oscillation to stabilize after VDD reaches the minimum value of the oscillation voltage range or the STOP mode has been released.
3:The oscillators below are recommended.
★4: When the oscillation frequency is 4.19 MHz < fx ≤ 5.0 MHz, do not select PCC = 0011 as the instruction execution time: otherwise, one machine cycle is set to less than 0.95 μs, falling short of the rated minimum value of 0.95 μs.
★Caution: When using the oscillation circuit of the main system clock, wire the portion enclosed in dotted line in the figures as follows to avoid adverse influences on the wiring capacity:
•Keep the wiring length as short as possible.
•Do not cross the wiring over the other signal lines. Do not route the wiring in the vicinity of lines through which a high alternating current flows.
•Always keep the ground point of the capacitor of the oscillator circuit at the same potential as VDD. Do not connect the power source pattern through which a high current flows.
•Do not extract signals from the oscillation circuit.
RECOMMENDED OSCILLATION CIRCUIT CONSTANTS
MAIN SYSTEM CLOCK: CERAMIC OSCILLATOR (Ta = -10 to +70°C)
Manufac- |
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| External Capacitance [pF] | Oscillation |
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Product Name | Voltage Range [V] | |||||||
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turer |
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| C1 | C2 | MIN. |
| MAX. | ||
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Murata | CSA 2.00MG | 30 | 30 | 4.75 |
| 5.25 | ||
Mfg. |
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CSA 4.19MG | 30 | 30 | 4.75 |
| 5.25 | |||
Co., Ltd. |
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| CSA 4.19MGU | 30 | 30 | 4.75 |
| 5.25 | ||
| CST 4.19MG | 30 pF (internal) | 30 pF (internal) | 4.75 |
| 5.25 | ||
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